docs(clients): fix a typo in command examples

[AllanZhengYP]

Description

Address a feedback in smithy-lang/smithy-typescript#325

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@@           Coverage Diff           @@
##             main    #2354   +/-   ##
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  Coverage        ?   60.09%           
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  Files           ?      472           
  Lines           ?    24862           
  Branches        ?     5887           
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  Hits            ?    14941           
  Misses          ?     9921           
  Partials        ?        0           

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